Our focus turns to the Roaring Twenties in the United States after World War I. Powerful families have positioned this New World nation as a rising superpower. Precious images from the Rockefeller Archive Center and other sources tell the story of how a late 19th century businessman made a fortune in oil and became the world's most powerful industrial magnate. Our images also track the J.P. Morgan financial powerhouse and its role in history, and the immigrants who helped build Hollywood among other American icons.